Classifications

• • C—CHEMISTRY; METALLURGY
  • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
  • C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
  • C09D201/00—Coating compositions based on unspecified macromolecular compounds
• • C—CHEMISTRY; METALLURGY
  • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
  • C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
  • C09D101/00—Coating compositions based on cellulose, modified cellulose, or cellulose derivatives
• • C—CHEMISTRY; METALLURGY
  • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
  • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
  • C08J7/00—Chemical treatment or coating of shaped articles made of macromolecular substances
  • C08J7/04—Coating
  • C08J7/0427—Coating with only one layer of a composition containing a polymer binder
• • C—CHEMISTRY; METALLURGY
  • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
  • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
  • C08J7/00—Chemical treatment or coating of shaped articles made of macromolecular substances
  • C08J7/04—Coating
  • C08J7/043—Improving the adhesiveness of the coatings per se, e.g. forming primers
• • C—CHEMISTRY; METALLURGY
  • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
  • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
  • C08J7/00—Chemical treatment or coating of shaped articles made of macromolecular substances
  • C08J7/04—Coating
  • C08J7/056—Forming hydrophilic coatings
• • C—CHEMISTRY; METALLURGY
  • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
  • C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
  • C09D105/00—Coating compositions based on polysaccharides or on their derivatives, not provided for in groups C09D101/00 or C09D103/00
  • C09D105/08—Chitin; Chondroitin sulfate; Hyaluronic acid; Derivatives thereof
• • C—CHEMISTRY; METALLURGY
  • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
  • C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
  • C09D189/00—Coating compositions based on proteins; Coating compositions based on derivatives thereof
• • C—CHEMISTRY; METALLURGY
  • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
  • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
  • C08J2323/00—Characterised by the use of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Derivatives of such polymers
  • C08J2323/02—Characterised by the use of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Derivatives of such polymers not modified by chemical after treatment
• • C—CHEMISTRY; METALLURGY
  • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
  • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
  • C08J2489/00—Characterised by the use of proteins; Derivatives thereof
• • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
  • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
  • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
  • Y10T428/00—Stock material or miscellaneous articles
  • Y10T428/25—Web or sheet containing structurally defined element or component and including a second component containing structurally defined particles
  • Y10T428/253—Cellulosic [e.g., wood, paper, cork, rayon, etc.]
• • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
  • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
  • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
  • Y10T428/00—Stock material or miscellaneous articles
  • Y10T428/31504—Composite [nonstructural laminate]
  • Y10T428/31551—Of polyamidoester [polyurethane, polyisocyanate, polycarbamate, etc.]
  • Y10T428/31573—Next to addition polymer of ethylenically unsaturated monomer
• • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
  • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
  • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
  • Y10T428/00—Stock material or miscellaneous articles
  • Y10T428/31504—Composite [nonstructural laminate]
  • Y10T428/31855—Of addition polymer from unsaturated monomers
  • Y10T428/31909—Next to second addition polymer from unsaturated monomers
• • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
  • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
  • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
  • Y10T428/00—Stock material or miscellaneous articles
  • Y10T428/31504—Composite [nonstructural laminate]
  • Y10T428/31855—Of addition polymer from unsaturated monomers
  • Y10T428/31909—Next to second addition polymer from unsaturated monomers
  • Y10T428/31928—Ester, halide or nitrile of addition polymer

Definitions

• the present invention relates to a coating material for forming an information display surface which makes up a medium for writing and printing letters etc. on the surface of a resin film, a plastic product and glass product, and a display medium on which the coating material is coated.
• Paper is usually used as a medium for displaying information in writing or printing.
• the paper is required to have high absorbency of water base ink in order to obtain a good drying characteristic and sharpness.
• an ink jet printer which is rapidly becoming popular accompanied by the popularity of personal computers and word processors is used to print onto a paper, similar characteristics are required of the paper.
• a coating material is coated on the surface of a base film.
• Polyvinyl alcohol and the like Japanese Patent Laid-open No. Hei 6-32047
• polyvinyl acetate-styrene copolymer Japanese Patent Laid-open No. Hei 6-219042
• the gummed label or the paper label when used, they must be prepared in advance and be stuck one by one on the product, which is a time-consuming job. Additionally, when the labels are pasted on plastic bottles, especially on a plastic shampoo bottle, they are apt to be peeled off during use because of poor water resistance, since the bottle is used under high temperature and high humidity conditions such as a bathroom.
• a coating material for an information display surface is prepared by mixing silica etc. into a resin, then the coating material thus obtained is printed on a surface of a plastic product or the like to form a coating film, and information is written on this coating film as a medium.
• an ultraviolet curable resin has been used for the resin, and since the coating material for preparing a surface for an information display containing the ultraviolet curable resin is extremely excellent in productivity and in coating film properties, it is getting to be the mainstream of the coating material for the information display surface.
• the coating material for forming the information display surface containing the ultraviolet curable resin is excellent in view of a working environmental and the curing time of the coating film is short since the solvent content is small. And the strength of the coating film is also excellent. Accordingly, the coating material is expected to rapidly spread over other fields such as the packaging field in the future.
• a CD-R recordable Compact Disk
• a paper label is not suitable for the purpose, because it can be peeled off to cause trouble of the CD drive. Therefore, the coating material without such disadvantages is expected to have demand as a medium for forming the information display surface of the CD-R.
• the coating material for forming the information display surface containing the above-described UV curable resin has many advantages, it is not flawless.
• the conventional coating material for forming the information display surface is poor in chemical resistance. So it has a disadvantage that the coating film becomes brittle and is peeled off when a print printed with this coating material is immersed in alcohol for 24 hours, for instance.
• a chemical additive is added in the coating material to improve alcohol resistance of the coating film formed of the coating material for forming the information display surface.
• the above method requires a complicated process of making the coating material for forming the information display surface prepared in a two-liquid type and combining them just before printing. And when excessive combined coating material remains, it must be disposed of because it is not suited to keep for a long time. Furthermore, when a printing work is continued for hours, troubles such as print failures due to increase of viscosity of the coating material, change of tint, and deterioration of the curing characteristic, could occur with the passage of time.
• the conventional coating material for forming the information display surface has advantages that the strength of the coating film is excellent and the water resistance is superior, it has disadvantages of poor feeling and poor writing acceptability (smoothness in writing) resulting from the properties of excess hardness, and no water absorbency.
• a matting agent has been mixed to the coating material to improve the appearance and the touch by making the surface of the coating film a matt finish, but sufficient improvement has not been obtained.
• a coating material for forming an information display surface according to first aspect of the present invention is characterized by containing a water absorbent substance and a water-soluble substance.
• water absorbent substance is optional, but it is necessary to choose a substance which does not give a harmful effect as a coating material when being mixed with other ingredients such as a binder and the like.
• the water-soluble substance includes synthetic materials, derivatives of natural substances (semi-synthetic materials), and natural substances.
• the water-soluble substance described above includes polyvinyl alcohol, polyvinyl pyrolidone, styrene-polyvinyl pyrolidone copolymer, cellulose derivatives (CMC and the like), water-soluble collagen, gelatin, betaine and so on.
• the coating material includes so-called ink or paint, according to a field applied.
• ingredients may be contained in the coating material as long as the water absorbent substance and the water-soluble substance are contained therein.
• the water absorbent substance is a fine powder of at least one of protein and polysaccharide.
• the average particle diameter of the fine powder is preferably less than 60 ⁇ m.
• the average particle diameter exceeds 60 ⁇ m, the surface of the display medium becomes rough and the touch becomes undesirable. The printability is likely to be deteriorated.
• the more preferable average particle diameter is less than 30 ⁇ m, and further preferably, less than 7 ⁇ m.
• the protein includes at least one material selected from the group consisting of collagen, silk, wool, keratin, and egg shell membrane.
• a concrete example of protein is not limited to the concrete examples cited above, but the cited examples are preferable in view of property, price, availability, etc.
• the polysaccharide includes at least one material selected from the group consisting of cellulose, chitin, and chitosan.
• a concrete example of the polysaccharide is not limited to the concrete examples cited above, but the above example is preferable in view of property, price, availability etc.
• the coating material of the present invention prefferably contains a resin base binder, as well as the water absorbent substance and the water-soluble substance described above.
• the resin base binder includes acrylic resin, acryl-styrene copolymer, polyvinyl acetate resin, and so on.
• a dispersion system it may be any one selected from the group consisting of emulsion (latex), colloidal dispersion and aqueous solution.
• the resin base binders preferably form a continuous coating film after being coated as a coating material and dried. When an aqueous resin solution is used, it is preferable to choose the one whose coating film becomes insoluble after drying.
• alcohol such as 2-propanol
• diluting agent when the coating material is diluted because it quickens drying after coating.
• a display medium has a display base material on which an information display surface comprising the aforementioned coating material for the information display surface is formed on a base material for display.
• Any display base material can be used for forming the display medium for the information display surface. It includes all materials such as, for instance, films for an overhead projector (OHP), drafting films, gummed labels, labels, packages, electric appliances, motor-car parts, precision parts, compact disks, various plastic molded products, metal, glass, painted boards, and slips for home-delivery.
• OHP overhead projector
• drafting films gummed labels, labels, packages, electric appliances, motor-car parts, precision parts, compact disks, various plastic molded products, metal, glass, painted boards, and slips for home-delivery.
• the display base material is a sheet (it may be a thin film), a polyolefin series resin sheet, especially a soil polyolefin series resin sheet is preferable.
• the soft polyolefin series resin includes, for instance, thermoplastic olefin series elastomers (TPO).
• TPO thermoplastic olefin series elastomers
• etylene-propylene co-polymer ethylene-propylene-diene copolymer, and so on.
• the soft polyolefin series resin sheet may have a multilayer structure, e.g. a triple-layer structure sheet made of multilayer series homo PP / L-LDPE /homo PP.
• a problem of adhesion to the coating material can be improved by adding inorganic filler such as titanium oxide into the base material, when the polyolefin series resin is used as the base material.
• the polyolefin type resin base material is weak in adhesive strength, it is necessary to apply a corona discharge treatment and an anchor coating to improve the adhesive strength to the coating material.
• the adhesive strength to the coating material can be improved only by applying the corona discharge treatment without anchor coating.
• a concrete coating method of the coating material is optional and when the coating is carried out by printing, silk-screen printing, pad printing, gravure (coater) printing, roll coater, knife coater, etc. can be applied.
• the display medium contains the water absorbent substance in the coating material, diffusion of water base ink into the display medium is refrained and the ink is quickly dried, resulting in a clear print of high definition. And since the display medium has a characteristic that the water base ink is not easily diffused being absorbed in the water absorbent substance, the display medium in water resistance can be improved.
• a coating material for forming an information display surface according to third aspect of the present invention is characterized by having an ultraviolet curable resin and a natural organic substance as a main component.
• Any resin such as urethane acrylate, epoxyacrylate and polyester acrylate, can be used as the ultraviolet curable resin.
• lactam type, ether type, and aromatic type, and the like can be optionally used as a monomer which is combined into the coating material.
• the coating film formed by using the coating material is improved in touch, chemical resistance, and writing smoothness thereof. Since the surface of the coating film is matted , it gives the printed matter a high-grade image.
• the coating material is a one-pack type, it is unnecessary to blend before printing, which makes it easy to handle without requiring manpower for handling. Since pot life of the coating material is long due to one-pack type, the amount of the wasted coating material can be reduced, which is desirable from economical and environmental standpoint. Furthermore, since the properties such as viscosity and the like does not change for a long period of time, it is suitable for printing for long time without a break.
• the natural organic substance can be a kind or more than two kinds selected from the group consisting of collagen, wool, keratin, shell membrane, silk, cellulose, hemp, cotton, chitin, chitosan, water-soluble silk, betaine, soybean protein, casein, and gelatin.
• the above-mentioned collagen, wool, keratin, shell membrane, silk, cellulose, hemp, cotton, chitin, and chitosan are nonaqueous natural organic substances.
• the aforementioned water-soluble silk (soluble silk protein which has a low molecular weight generated by enzyme decomposition etc.), betaine, soybean protein, and gelatin are water-soluble organic substances.
• the content of the natural organic substance is preferably from 1 wt % to 50 wt %.
• the preferable content is from 10 wt % to 40 wt %.
• the content is less than 1 wt %, it becomes difficult to obtain good touch, chemical resistance, and writing smoothness of the coating film.
• the form of the aforementioned natural organic substance may be powdery (in powder form).
• the average particle diameter of the aforementioned natural organic substance is preferably less than 60 ⁇ m.
• the average particle diameter is preferably less than 30 ⁇ m, more preferably less than 15 ⁇ m, and the most preferable average particle diameter is less than 5 ⁇ m.
• the coating material for forming the information display surface can be aqueous.
• a water-soluble natural organic substance such as water-soluble silk or betaine is combined with an aqueous ultra-violet curable resin (an aqueous UV coating material).
• an aqueous ultra-violet curable resin an aqueous UV coating material.
• a hydrophilic coating film having superior properties can be obtained since the water-soluble natural organic substance is uniformly dispersed in the coating material.
• the surface of the coating film is smooth unlike the surface of a powdery dispersion, which contributes to improve the uniformity of the writing smoothness.
• a printed matter according to a fourth aspect of the present invention is a printed material on which the information display surface made of the coating material for forming the information display surface according to the third aspect is printed.
• Any concrete method for the printing (coating) can be used, for instance, such as a silk screen printing, a pad printing, a gravure printing (coater), a roll coater, a knife coater, and so on.
• the particle diameter of the used power sometimes has to be selected appropriately in accordance with mesh size of the screen or the depth of the gravure printing plate according to the printing method actually employed.
• the printed matter includes so-called coated matter, depending on a field of industry to be applied.
• the material to be printed is optional and includes all sorts of articles such as packages, electric appliances, motor car parts, precision parts, compact discs, various plastic moldings, metal, glass, a coated board, a slip for home delivery and others. And it can be applied to a graphic field, a design field, printing having functional property (functional property such as chemical resistance, writing smoothness, etc.) and others.
• a coating material for forming an information display surface containing a resin type binder, a water absorbent substance, and a water-soluble substance is prepared.
• the coating material thus prepared is coated on a substrate to form a display medium as the information display surface.
• a concrete example of each component in the coating material and the compound ratio are decided as follows. acryl emulsion 32 % silk powder 26 % polyvinyl alcohol water solution (5 %) 33 % 2-propanol / butyl cellosolve (2 : 1) 6 % water 3%
• coating material is diluted with aqueous 2-propanol solution, thus obtained coating material is coated on a PET (polyethylene terephthalate) film for an OHP (over head projector) (manufactured by RICOH Co., Ltd.) with a bar coater to form the display medium.
• OHP over head projector
• the coating material is prepared with the following water absorbent substances as a concrete example, and the same components as in example 1 for the other ingredients.
• the display medium is formed by coating the coating material of each example on a PET film.
• the water absorbent substances are collagen powder in example 2, cellulose powder in example 3, chitosan powder in example 4, chitin powder in example 5, wool in example 6, keratin powder in example 7, and egg shell membrane in example 8.
• a soil polyolefin type sheet is used instead of the PET film in example 1.
• the sheet is treated with a corona discharge treatment on the surface to improve the adherence to the coating material, the sheet is coated with a PP adhesive emulsion (emulsion-vinyl acetate copolymer) as an anchor coat.
• a PP adhesive emulsion emulsion-vinyl acetate copolymer
• the soft polyolefin type sheet has a triple-layer structure consisting of homo PP (Idemistu PP F-704NP (trade name)) / L-LDPE (Affinity PL188 (trade name)) / homo PP (Idemistu PP F-704NP (trade name)).
• a polypropylene sheet containing titanium oxide is used and a corona discharge treatment is applied on the surface thereof to improve the adherence to the coating material.
• the coating material in each comparison is prepared by the following substances. And a display medium is formed on the PET film in the same way as in example 1 with each coating material.
• the coating material according to comparison 1 is composed of an acryl emulsion.
• the coating material according to comparison 2 is the coating material of example 1 excluding polyvinyl alcohol.
• the coating material according to comparison 3 is the coating material in example 1 excluding silk powder.
• the coating material according to comparison 4 is composed only of aqueous polyvinyl alcohol solution (5%).
• the drying characteristic of the coating materials according to the examples from 1 to 10 and comparisons from 1 to 5 after coating on a substrate and the water resistance of the display medium thus formed are evaluated. And after printing on each display medium with an ink jet printer (Mach Jet MJ00-800C, trade name, EPSON HANBAI Co., Ltd.), the drying characteristic of the water base ink and the sharpness of the print are also evaluated. These results are shown in tables 1 and 2.
• the drying characteristic of the coating material is evaluated by peeling the display medium a piece of adhesive cellophane tape after heating the coated display medium at 60°C for 3 minutes to dry the medium.
• the meaning of each mark is as follows. ⁇ The display medium is not peeled by the adhesive tape. X ⁇ The display medium is peeled by the adhesive tape or adhesion failure of the adhesive tape occurred due to insufficient drying.
• the water resistance is evaluated by the following method.
• the display medium is formed on a PET film and dried completely. Then the film is dipped into water for 5 minutes and checked the residue of the display medium (the coating layer).
• the display medium is remained in a same form as formed and is able to be printed thereon by the ink jet printer after it is dried.
• ⁇ Some percentages of the display medium remained and it was possible to print on the dried display medium by the ink jet printer, but the printed image is blurred.
• X Most display medium is dissolved out and it is impossible to print on the film with the ink jet printer.
• the drying characteristic of the printing is evaluated by checking the period of time from printing before the ink is dried and is not blurred even when the printed surface is rubbed by a finger. ⁇ Dried within 3 minutes. ⁇ Dried within 30 minutes. X ⁇ Does not dry even after 30 minutes.
• the sharpness of the print is evaluated enlarging the print surface to check the shape of the ink dot by enlarging the print surface.
• ⁇ The ink dot is a round shape.
• ⁇ The ink dot is blurted.
• X An original picture or letter can not be seen on the printed surface.
• Example 1 ⁇ ⁇ ⁇ ⁇ Example 2 ⁇ ⁇ ⁇ ⁇ Example 3 ⁇ ⁇ ⁇ ⁇ Example 4 ⁇ ⁇ ⁇ ⁇ Example 5 ⁇ ⁇ ⁇ ⁇ Example 6 ⁇ ⁇ ⁇ ⁇ Example 7 ⁇ ⁇ ⁇ ⁇ Example 8 ⁇ ⁇ ⁇ ⁇ Example 9 ⁇ ⁇ ⁇ ⁇ Example 10 ⁇ ⁇ ⁇ ⁇ ⁇ After Coating After Printing by printer Drying Characteristic Water Resistance Drying Characteristic Sharpness Comparison 1 ⁇ ⁇ X X Comparison 2 ⁇ ⁇ ⁇ Comparison 3 ⁇ X X X Comparison 4 X X X X Comparison 5 X ⁇ ⁇ ⁇
• each display medium according to examples 1 to 10 is composed of a coating material which contains a resin type binder, a water absorbent substance, a water-soluble substance, and contains an organic solvent.
• the drying characteristic of the water base ink after printing on the display medium by the ink jet printer is excellent and the printed patterns and letters are sharp.
• the drying characteristic after printing and the sharpness are not so good because the coating material for the display medium according to comparison 2 does not contain water-soluble polyvinyl alcohol.
• the water resistance of the display medium is not good and the drying characteristic after printing and the sharpness are inferior, because the display medium according to comparison 3 does not contain silk powder, which is a water absorbent substance, in the coating material.
• the drying characteristic of the coating material as well as the water resistance of the display medium is poor, because the coating material of the display medium of comparison 4 is made of an aqueous polyvinyl alcohol solution.
• the drying characteristic of the water base ink after printing and the sharpness are also inferior.
• the drying characteristic of the coating material is inferior, because the display medium according to comparison 5 does not contain an organic solvent in the coating material though it contains a resin type binder, a water absorbent substance and a water-soluble substance.
• a coating material for forming an information display medium of the present embodiment can be obtained by adding, stirring and dispersing one or more than one kind of natural organic substance selected from the group consisting of collagen, wool, keratin, egg shell membrane, silk, cellulose, hemp, cotton, chitin, chitosan, water-soluble silk, betaine, soybean protein, casein, and gelatine to an ultraviolet curable resin so that the content of these materials is 1 to 50 wt %.
• the printed matter of the present embodiment has a coating film as an information display surface formed by printing the coating material on the article to be printed.
• the coating material for forming an information display surface of the present embodiment is prepared by mixing, stirring and dispersing 60 unit by weight of the varnish and 40 unit by weight of collagen powder with a dissolver at below 40°C and 1000 rpm.
• the varnish used in the example is Sericol UV PAL (trade name, manufactured by TEIKOKU PRINTING INKS MFG. CO., LTD.).
• the average particle diameter of the collagen powder is 5 ⁇ m.
• a coating film to be an information display surface is formed by printing the coating material for forming the information display surface on a flame-treated polyethylene sheet by a silk screen printing machine (300 mesh).
• the sheet on which the coating film is formed is put on a belt and the coating film is cured with metal halide lamps (80W / cm ⁇ 2 lamps) while moving on a belt at a speed of 10 meters per minute to obtain the printed matter of the present embodiment.
• metal halide lamps 80W / cm ⁇ 2 lamps
• Coating materials for forming the information display surface are prepared in the same manner as in example 11 replacing a natural organic powder in example 11 with the following substances, and printed matters are obtained.
• a coating material for forming an information display surface is prepared by mixing, stirring and dispersing 100 unit by weight of the coating material with 40 unit by weight of silk powder (the average particle diameter is 5 ⁇ m) in the same manner as in the example 11.
• the aqueous UV coating material which is used in the example is Sericol UV-AU (trade name, manufactured by TEIKOKU PRINTING INKS MFG. CO., LTD.).
• the coating material for the information display surface is prepared and a printed matter is obtained in the same manner as in example 11.
• the coating material for forming the information display surface is prepared by mixing water-soluble silk to 20 unit by weight of silk powder (the average particle diameter is 5 ⁇ m) and 100 unit by weight of water base UV coating material (the aforementioned Sericol UV - AU) so that the solid content ratio of the water-soluble silk is 5 %, and by stirring and dispersing in the same manner as in example 11 to obtain the coating material for forming the information display surface of the present example.
• a printed matter of the present example is obtained in the same manner as in example 11 using the above coating material for forming the information display surface.
• Silica powder which is a natural inorganic powder is used instead of the natural organic powder.
• a mixture of 15 unit by weight of the silica powder and 100 unit by weight of the varnish is stirred and dispersed in the same way as in example 11 to prepare the coating material for forming the information display surface of the present comparison.
• the evaluation of the printability is carried out by measuring the drying time from printing by a printer (BUBBLE JET PRINTER BJ10V Lite (trade name) manufactured by CANON Inc.) till the printed letter is dried. 3 : within 1 minute, 2 : less than 1 hour, 3 : more than 1 hour.
• the evaluation of writing smoothness is carried out by writing a Japanese letter with a water base ink pen (Mitsubishi PIN (trade name) manufactured by MITSUBISHI PENCIL Co., Ltd.) and evaluating the smoothness of the writing in a sensory testing manner. 3 : especially smooth in writing, 2 : smooth in writing, 1 : not smooth.
• the evaluation of the seal impression acceptability is carried out by measuring the drying time from stamping with a rubber stamp till the print letter is dried. 3 : within 1 minute, 2 less than 1 hour, 3 : more than 1 hour.
• the evaluation of the alcohol resistance is carried out in accordance with the JIS cross-cut adhesion test after the coating film is dipped in 99.5 % ethanol for 24 hours. 3 : more than 5 points, 2 : 3 to 5 points, 1: less than 3 points.
• the evaluation of the hypochlorous acid resistance is carried out by the following method.
• a board on which the coating film is formed is dipped in 1.1 % aqueous sodium hypochlorite solution for 24 hours. After the board is washed and dried, the coating film is rubbed 20 times with gauze to check whether the base of the board is exposed. 3 : no exposure of the base, 2 the base is slightly exposed, 1: the base is completely exposed.
• Coating material for forming an information display surface according to the present invention can be used to form a medium for writing and printing letters and the like on resin films, plastic products and glass products etc.

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• 1997
  • 1997-06-07 TW TW88115288A patent/TW565599B/zh not_active IP Right Cessation
  • 1997-06-07 TW TW86107909A patent/TW386102B/zh not_active IP Right Cessation
  • 1997-06-09 EP EP97924354A patent/EP0933411A4/de not_active Withdrawn
  • 1997-06-09 KR KR10-1999-7001344A patent/KR100510629B1/ko not_active IP Right Cessation
  • 1997-06-09 US US09/242,377 patent/US20020012787A1/en not_active Abandoned
  • 1997-06-09 WO PCT/JP1997/001957 patent/WO1998007799A1/ja active IP Right Grant

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